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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | STANDARDS | SEE ALSO | AUTHOR | COLOPHON |
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ACL_CHECK(3) Library Functions Manual ACL_CHECK(3)
acl_check — check an ACL for validity
Linux Access Control Lists library (libacl, -lacl).
<sys/types.h> <acl/libacl.h> int acl_check(acl_t acl, int *last)
The acl_check() function checks the ACL referred to by the
argument acl for validity.
The three required entries ACL_USER_OBJ, ACL_GROUP_OBJ, and
ACL_OTHER must exist exactly once in the ACL. If the ACL contains
any ACL_USER or ACL_GROUP entries, then an ACL_MASK entry is also
required. The ACL may contain at most one ACL_MASK entry.
The user identifiers must be unique among all entries of type
ACL_USER. The group identifiers must be unique among all entries
of type ACL_GROUP.
If the ACL referred to by acl is invalid, acl_check() returns a
positive error code that indicates which type of error was
detected. The following symbolic error codes are defined:
ACL_MULTI_ERROR The ACL contains multiple entries that have
a tag type that may occur at most once.
ACL_DUPLICATE_ERROR The ACL contains multiple ACL_USER entries
with the same user ID, or multiple
ACL_GROUP entries with the same group ID.
ACL_MISS_ERROR A required entry is missing.
ACL_ENTRY_ERROR The ACL contains an invalid entry tag type.
The acl_error() function can be used to translate error codes to
text messages.
In addition, if the pointer last is not NULL, acl_check() assigns
the number of the ACL entry at which the error was detected to
the value pointed to by last. Entries are numbered starting with
zero, in the order in which they would be returned by the
acl_get_entry() function.
If successful, the acl_check() function returns 0 if the ACL
referred to by acl is valid, and a positive error code if the ACL
is invalid. Otherwise, a value of -1 is returned and the global
variable errno is set to indicate the error.
If any of the following conditions occur, the acl_check()
function returns -1 and sets errno to the corresponding value:
[EINVAL] The argument acl is not a valid pointer to an
ACL.
This is a non-portable, Linux specific extension to the ACL
manipulation functions defined in IEEE Std 1003.1e draft 17
(“POSIX.1e”, abandoned).
acl_valid(3), acl(5)
Written by Andreas Gruenbacher <andreas.gruenbacher@gmail.com>.
This page is part of the acl (manipulating access control lists)
project. Information about the project can be found at
http://savannah.nongnu.org/projects/acl. If you have a bug
report for this manual page, see
⟨http://savannah.nongnu.org/bugs/?group=acl⟩. This page was
obtained from the project's upstream Git repository
⟨git://git.savannah.nongnu.org/acl.git⟩ on 2024-06-14. (At that
time, the date of the most recent commit that was found in the
repository was 2024-04-25.) If you discover any rendering
problems in this HTML version of the page, or you believe there
is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
Linux ACL March 23, 2002 ACL_CHECK(3)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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